Exercise multiple ansible versions in CI (#8172)

* Ansible: separate requirements files for supported ansible versions

* Ansible: allow using ansible 2.11

* CI: Exercise Ansible 2.9 and Ansible 2.11 in a basic AIO CI job

* CI: Allow running a reset test outside of idempotency tests and running it in stage1

* CI: move ubuntu18-calico-aio job to stage2 and relay only on ubuntu20 with the variously supported ansible versions for stage1

* CI: add capability to install collections or roles from ansible-galaxy to mitigate missing behavior in older ansible versions

.gitlab-ci/packet.yml

@@ -23,15 +23,34 @@
   extends: .packet
 
 packet_ubuntu18-calico-aio:
-  stage: deploy-part1
+  stage: deploy-part2
   extends: .packet_pr
   when: on_success
 
-# Future AIO job
+# The ubuntu20-calico-aio jobs are meant as early stages to prevent running the full CI if something is horribly broken
 packet_ubuntu20-calico-aio:
   stage: deploy-part1
   extends: .packet_pr
   when: on_success
+  variables:
+    RESET_CHECK: "true"
+
+# Exericse ansible variants
+packet_ubuntu20-calico-aio-ansible-2_9:
+  stage: deploy-part1
+  extends: .packet_pr
+  when: on_success
+  variables:
+    ANSIBLE_MAJOR_VERSION: "2.9"
+    RESET_CHECK: "true"
+
+packet_ubuntu20-calico-aio-ansible-2_11:
+  stage: deploy-part1
+  extends: .packet_pr
+  when: on_success
+  variables:
+    ANSIBLE_MAJOR_VERSION: "2.11"
+    RESET_CHECK: "true"
 
 # ### PR JOBS PART2